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What is matter made of? B. NOT A PURE SUBSTANCE Mixtures - 2 or more substances mixed together not chemically combined Substances keep their properties Solutions are the “best-mixed” mixture

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Changes in Matter Physical change: alters the form, but not its identity Chemical change: a substance that changes or combines to form a new substance Chemical activity: the ability of a substance to change

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Testing your knowledge…. In the photos, can you tell which is an element, compound, or mixture. Review: An element contains just one type of atom. A compound contains two or more different atoms joined together. A mixture contains two or more different substances that are only physically joined together, not chemically. A mixture can contain both elements and compounds.